Browsing Fakultät für Geowissenschaften und Geographie (inkl. GAUSS) by Advisor "Wörner, Gerhard Prof. Dr."
Now showing items 1-14 of 14
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A remote sensing and geospatial statistical approach to understanding distribution and evolution of ignimbrites in the Central Andes with a focus on Southern Peru
(2014-03-25)This PhD thesis investigates timing, cause and location of “ignimbrite flare ups” during the evolution of the Central Andean uplift and relates volcano-tectonic structures and calderas with shallow intrusive stocks to ... -
Composition and compositional zoning of olivine as a tracer for pre-eruptive magmatic processes: Application to Piton de la Fournaise, Laacher See, and Shiveluch volcano
(2020-08-12)This dissertation deals with the reconstruction of pre-eruptive magmatic processes with respect to their timescales. Deep recharges of mafic magma into shallower reservoirs and subsequent magma mixing are assumed to play ... -
Constraints on pre-eruptive magmatic history using multi-faceted diffusion modeling: an analytical, experimental and numerical study
(2020-05-28)Time-scales extracted from chemically zoned minerals provide insights into crystal residence time, magma storage and compositional evolution of magmas and allow better constraints on pre-eruptive history of large and ... -
Darstellung magmatischer Prozesse über die U-Th Ungleichgewichts-Methode. Vergleich von zwei andinen magmatichen Systemen: Vulkan El Misti (Südperu) versus des Taapaca Vulkankomplexes (Nordchile).
(2009-03-10)El Misti Volcano (South Peru) and Taapaca Volcanic Complex (North Chile) both located in the Central Andean Volcanic Zone in South America have been studied in order to place constrains on ... -
Differentiation regimes in the Central Andean magma systems: case studies of Taapaca and Parinacota volcanoes, Northern Chile
(2014-10-29)Volcanoes have shaped the Earth’s surface and are nature’s most awesome manifestation of the power within our planet (Rosaly M. Lopes). Compositional and mineralogical diversity of erupted lavas reflects distinct magma ... -
Generating early continental crust
(2020-07-09)Archean cratons are the products of geodynamic processes governing the evolution of the early Earth. They comprise felsic granitoids enclosed by folded volcano-sedimentary successions. However, these rocks may not be ... -
History and geochemical evolution of igneous rocks forming the Panama land bridge since Late Cretaceous
(2011-10-24)Major and trace elements, Sr-, Nd-, Pb-, and O-isotopes and 40Ar/39Ar dating of igneous rocks from the Cordillera de Panama and the Soná and Azuero Peninsulas define the magmatic evolution ... -
Laser Ablation-Inductively Coupled Plasma-Mass Spectrometer (LA-ICP-MS) in Geosciences: Further Improvement for Elemental Analysis
(2017-09-08)A quantitative reduction strategy consisting of Ratioing, Standardization, and Normalization (RSN) was proposed to process the LA-ICP-MS transient signal of NIST, MPI-DING, USGS and CGSG glass reference materials. The RSN ... -
Mechanisms of magma emplacement in the upper crust
(2009-05-15)The mechanisms that control magma emplacement in the upper crust are characterised by brittle failure of the host rock and subject to the influence of magma. This thesis is a compilation ... -
Metamorphic fluids at extreme pressure conditions and their significance for element transfer in subduction zones
(2017-05-15)The present study provides a comprehensive geochemical dataset on ultra-/high pressure (UHP/HP) eclogites and enclosed, fluid-deposited metamorphic veins. It targets to broaden our understanding of the nature and extent ... -
Source and magmatic evolution of the Neapolitan volcanoes through time (Southern Italy)
(2019-05-10)This study provides a multidisciplinary approach, based on separated single minerals from Neapolitan volcanic products aimed to extend the present knowledge on the evolution of the Neapolitan magma source(s). Of particular ... -
The causes and effect of temporal changes in magma generation processes in space and time along the Central Andes (13°S – 25°S)
(2015-11-27)This thesis investigates the timing and causes of the transition between two different magmatic regimes during the evolution of the Central Andean uplift. The first volcanic regime is represented by Miocene lava shields, ... -
Variations in magma composition in time and space along the Central Andes (13°S-28°S)
(2006-11-01)Meso-Cenozoic magmatic arc systems of the Central Andes (CA) result from the subduction of the Nazca Plate beneath the South America plate since Jurassic time, the arc progressively shifted ...